BOULDER COUNTY, Colo. (CBS4) – Investigators say a massage therapist in Boulder Canyon sexually assaulted at least one client and detectives believe more women may have been victimized.

According to the Boulder County Sheriff’s Office, Gregory Mingchiu Ching, 54, was arrested on July 30 and charged with sexual assault.

Gregory Mingchiu Ching (credit: Boulder County Sheriff’s Office)

Ching is a massage therapist who also owns a greenhouse. The charges allege he lured a woman who was injured to his massage studio at his home and sexually assaulted her.

Authorities said the victim met Ching through Facebook.

“He asked for her assistance with a booth at the fair where he was to sell greenhouse construction material,” the sheriff’s office said in a statement. “He indicated he would be unable to pay her, but offered her an aquatic massage in trade.”

The woman told deputies she was sexually assaulted during the massage.

“He actually took her towards the middle of the pool. She was in fear that she was going to drown,” Don Dillard with the Boulder County Sheriff’s Department said. “So she just kind of didn’t fight.”

“There’s no one around to hear you even if you were to scream,” Dillard said.

Dillard said he strongly believes there are other victims.

Additional Information From The Boulder County Sheriff’s Office

The Sheriff’s Office believes our current victim may not be the first person who has been victimized by Gregory Ching. If you have information about previous assaults, we would like to speak with you. Please contact Detective Don Dillard at 303-441-4992.